Riser construction with separate upper relatively large reusable section



Nov. 5, 1968 I J v, wszo 3,409,267

RISER CONST TION WITH SEPARATE UPPER RELATIVELY GE REUSABLE SECTION Filed July 30, 1965 2 Sheets-Sheet 1 #vwnvrom JOSEPH l WSZOLEK.

Nov. 5, 1968 J. v. WSZOLEK 3,409,267

RISER CONSTRUCTION WITH SEPARATE UPPER RELATIVELY LARGE REUSABLE SECTION 2 Sheets-Sheet 2 Filed July 30, 1965 I/VVE/VTOR. JOSEPH V; WSZOLEK B) m I ,y

United States Patent 3,409,267 RiSER CONSTRUCTION WITH SEPARATE UPPER RELATIVELY LARGE REUSABLE SECTION Joseph V. Wszolek, Villa Park, Ill., assignor to Amsted Industries Incorporated, Chicago, Ill., a corporation of New Jersey Filed July 30, 1965, Ser. No. 476,046 Claims. (Cl. 249-105) ABSTRACT OF THE DISCLOSURE In arrangements for bottom pressure casting, particularly into a mold made up of a plurality of blocks defining the cavity, the riser is made in two separate sections, each of which can be fabricated apart from the mold and assembled therewith. The lower riser section comprises insulating material and, at times, a metal liner, and is expendable. The upper riser section is larger than the lower section and is reusable for the pouring of successive castings.

The present invention relates to ingate and riser construction, particularly such construction as is attachable to molds that are adjustable for varying the size of cavity therein.

A broad object of the invention is to provide ingate and riser construction of the general character stated, which is of inexpensive construction and at least in part expend able.

Another object is to provide ingate and riser construction of simple character and which can be easily and quickly built or constructed apart from the mold and later assembled in the mold, and alternatively in which at least a part of it can be built in place in the mold if desired.

Still another object is to provide ingate and riser construction of the foregoing general character, for use in conjunction with an adjustable mold in which at least certain of the blocks forming the mold are adjustable for forming castings of different dimensions, and in which at least one of the mold blocks is provided with novel supporting means which in any position of the adjustment of that mold block the supporting means functions to support the riser box in position when the latter is placed in the mold.

Other objects and advantages of the invention will appear on the following detailed description of the accompanying drawings in which;

FIGURE 1 is a vertical longitudinal view, oriented according to line 1-1 of FIGURE 3, taken through a mold in which the ingate and riser construction is incorporated, the later being shown in elevation;

FIGURE 2 is a large scale view of the upper right hand corner of FIGURE 1 with the ingate and riser construction shown in vertical sectional view;

FIGURE 3 is a top view of FIGURE 1;

FIGURE 4 is a sectional view taken at line 4-4 of FIGURE 2;

FIGURE 5 is a front view taken at line 5-5 of FIG- URE 1; and

FIGURE 6 is a partial sectional view similar to the portion of FIGURE 2 encircled in dot-dashlines showing slightly different details of construction for use in the case where the lower part of the riser box construction is formed in place in the mold.

See

Referring now in detail to the drawings, the mold with which the ingate and riser construction is utilized, is indicated in its entirety at 10, and the ingate and riser construction itself indicated at 12. The mold 10 is of a kind presently known and is adjustable for varying the dimensions of the cavity therein for providing castings of different sizes. The mold includes main side blocks 14 and 16 and a set of inner blocks including a top block 18, a bottom block 20, and a rear end block 22, all of graphite. The main side blocks and these inner blocks define therebetween a cavity 24 which has an open front end closed by the ingate and riser construction 12. The rear end block 22 is adjustable to various positions along the length of the mold, i.e., to the right or left, FIGURE 1, for defining a longer or shorter cavity. The top block 18 is adjusted vertically for determining the height of the cavity and thus the width of the casting to be cast therein, and for each adjusted position of the top block a different rear end block 22 is provided according to the height of the cavity at such position.

The main side blocks 14 and 16 are adjustable toward and from each other for providing various widths of cavity, and for each such positon of the main side blocks, a different set of inner blocks 18, 20 and 22 is provided, each set being of a thickness corresponding to the selected width of cavity.

The ingate and riser construction 12 includes a riser box indicated in its entirety at 26. Cooperating with this riser box is a set of ingate blocks (FIGURE 4) which include a pair of front side blocks 28 and 30 and a front end block 32 therebetween, these blocks also being made of graphite. These ingate blocks are mounted in position in a manner described hereinbelow. The front end block 32 which is gripped between front side blocks 28 and 30 is of less dimension than the side blocks in longitudinal direction of the mold, whereby to provide an ingate passage 36 between the front side blocks. This ingate passage opens downwardly and communicates with a passage 38 through a pouring gate construction 40 of conventional construction which is brought into pouring communication with a ladle for pressure pouring in a known manner. Molten metal on rising passes through the passages 38 and 36 and into the cavity 24. The bottom block 20 and the top block 18 terminate forwardly adjacent the front end of the main side blocks 14 and 16 of the mold whereby to provide continuity of the ingate passage 36 throughout the height of the mold. The ingate blocks 28, 30 and 32 preferably terminate upwardly flush with the top surface of the main side blocks of the mold.

The riser box 26 includes an upper large section 42, and a lower reduced section 44 fitting into the ingate passage 36 and extending downwardly to a position adjacent the under surface of the top block 18. The lower section 44 includes a central steel liner or tube, or stove pipe, 46 disposed prefer-ably centrally of the ingate passage 36 and surrounded with sand 48 which fills the space between the liner and the walls of the ingate passage. This lower section 44 preferably is preformed in a core box having the same dimensions as the ingate passage 36 so as to produce a tight fit between the section 44 and the ingate passage. In the formation of thissection, the liner is placed in the core box and the space around the liner is filled with sand 48 which solidifies in place in a known curing process, and after the section is thus formed it is put in place in the mold in position shown in FIGURE 2.

The liner 46 is preselected as to length so'that the lower end of the section 44 is in the desired position with the lower end adjacent the under surface of the top block 18, as indicated, and the liner extends slightly above the mold blocks. The sand 48 is formedinto a flange 56 which, when the section is in place, rests on the upper surface of the corresponding mold blocks. This flange has its upper surface flush with the upper end of the liner 46, and it extends principally forwardly and to the sides but it does not extend to the rear. It is slightly intended at the rear, as shown at 57, for reception of an element of the upper section 42 as described hereinbelow.

The upper large section 42 of the riser box includes an outer steel casing 58, preferably rectangular or square in cross section and a steel liner 60 therein and disposed centrally thereof. The liner 60 is preferably cylindrical and is of larger diameter than the liner 46. The space between the outer steel casing 58 and the liner 60 is filled with core sand 62 cured in place similarly to the sand 48. The outer steel casing 58 may have a lifting eye bolt 63 for hooking by a crane for lifting it into and out of position.

In the use of the apparatus and the assembly of the mold and riser construction, the mold is adjusted according to the desired dimensions of the cavity, i.e., the inner blocks are selected according to the desired width of cavity and the adjustable ones of those blocks are adjusted to provide the desired length and height thereof. The lower section 44 of the riser box construction is formed in the core box at a remote point, as described above, and then put in place in the mold, with the flange 56 resting on the top surface of the mold blocks. Then the upper section 42, which has been preformed is put in place with the lower end of the outer steel casing in position surrounding the flange 56. The outer steel casing 58 fits in the indentation 57 whereby to provide a continuous flush surface on the rear sides of the lower and upper sections 44 and 42.

A backing block 64 is secured to the upper surface of the top block 18 at the forward end thereof, flush with the forward end of that block. This backing block is of such height as to provide a support for the rear side of the lower section 44 in the space between the main side blocks and prevent its tilting rearwardly, and reaches above that section to support the upper section 42 as well. This backing block may be of such height that regardless of the vertical position of the top block 18 it will extend the full height of the main side blocks and thus the full height of the lower section 44 of the riser box, and preferably is of sufiicient height to provide backing support for the upper section 42 even in the lower positions of the top block.

The upper large section 42 may be made up at a place remote from the mold, as desired, and in so doing, the liner 60 is centered in the outer casing 58 and the sand placed in the space therebetween and after the sand is cured as above stated, the assembly is put in place as mentioned. The liner 60 is shorter than the outer casing 58 and the sand terminates at the lower end of the liner enabling the casing to telescope over the flange 56 on the lower section. The upper large section is held securely in position against displacement by molten metal flowing thereinto by both the telescoping connection with the lower section and the backing block 64.

It will be noted that the liner 46 is smaller than the ingate passage 36, providing a small riser, but the greater diameter of the liner 60 in the upper section provides greater capacity for molten metal to compensate for substantial reduction in volume in the cavity of the mold pursuant to cooling of the molten metal therein. The liner 46 may be meltable by the molten metal rising into the riser box, as is the liner 60, although as a practical matter only the lower portion of the liner 46 is actually melted.

It is alsopossible to formthe lower section 44 in place in the mold after the mold blocks are set according to their desired adjusted position. For this purpose attention is directed to FIGURE 6. An annular plate 65 having an outer dimension corresponding to the surfaces of the ingate passage 36 is put in place and held temporarily by suitable means and the sand 48 is put in place and cured. Thereafter, the plate 65 will be held in place and may be left there in the casting step, or it may be removed before casting, as desired.

After the casting operation is completed the mold is taken apart, separating the ingate and riser blocks 28, 30 and 32. This exposes the sand 48 which may be knocked out, but it may be reclaimed according to known procedures. The upper large section 42 may be intact and re-usable, the molten metal having entirely receded, or it may be knocked down and rebuilt, using the outer casing 58 which will not be impaired.

Various kinds of means may be provided for supporting the ingate blocks 28, 30 and 32 in position relative to the mold, but this means does not per se enter into the present invention. For example, the main side blocks 14 and 16 of the mold may be mounted in and carried by framework sections 66 which when moved toward and from each other carry the main side blocks correspondingly. Supported on this framework may be other frame elements 68 abutting the side surfaces of the ingate side blocks 28 and 30. Clamps 70 are secured to the frame elements 68 and extending rearwardly from the clamps 70 are plates 72 fitted in grooves 74 in the blocks.

The front end block 32 may be mounted on a channel 76 by means of a plurality of clamps 78 having legs extending through apertures in the channel and toes fitted in the grooves in the side surfaces in the front block. Screws are threaded through the clamps 78 and into engagement with the channel 76 for maintaining the channel, front block and clamps in a rigid assembly. A bail 82 may be secured to the channel for use in lifting the assembly into and out of position.

While I have described herein a preferred embodiment of the invention, it will be understood that changes may be made therein within the scope of the appended claims.

I claim:

1. In a mold,

a plurality of blocks defining the peripheral surfaces of a cavity and a riser passage rising therefrom,

a two-part riser box construction consisting of a lower section of relatively small cross-sectional area in said riser passage and a separable upper section of relatively large cross-sectional area mounted on the top of the lower section,

said upper section including a metallic outer casing,

a metallic inner liner, and insulation disposed therebetween, said outer casing being telescoped over the upper end of the lower section,

said lower section including an inner liner extending at least the length of said riser passage, and insulation disposed between said lower section inner liner and the blocks defining said riser passage,

and said upper section being detachable from the lower section for removal and re-use.

2. The combination claimed in claim 1 wherein the lower section includes a metal liner covering the inner surface of the insulation.

3. The combination claimed in claim 2 including a bottom plate at the lower end of the riser box supporting the insulation in the lower section.

4. The combination claimed in claim 1 wherein the lower section extends above the riser passage and at least partially overlies the blocks which define said passage.

5. The combination claimed in claim 1 wherein the mold includes main side blocks and a top block therebetween which defines the upper surface of the cavity.

said top block being adjustable vertically for selectively defining cavities of different height,

in combination with a backing block disposed above the top block and defining a side surface portion of the riser passage.

Referehces Cited UNITED STATES PATENTS Heintz 164-15 Sylvester 249'-105 Gathmann 249-201 Sylvester 249-174 I. SPENCER OVERHOLSER, Primary Examiner.

ROBERT D. BALDWIN, Assistant Examiner. 

